/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.dialer.blocking;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.content.DialogInterface.OnShowListener;
import android.os.Bundle;
import android.view.View;
import com.android.dialer.blocking.BlockedNumbersMigrator.Listener;
import java.util.Objects;

/**
 * Dialog fragment shown to users when they need to migrate to use {@link
 * android.provider.BlockedNumberContract} for blocking.
 */
public class MigrateBlockedNumbersDialogFragment extends DialogFragment {

  private BlockedNumbersMigrator blockedNumbersMigrator;
  private BlockedNumbersMigrator.Listener migrationListener;

  /**
   * Creates a new MigrateBlockedNumbersDialogFragment.
   *
   * @param blockedNumbersMigrator The {@link BlockedNumbersMigrator} which will be used to migrate
   *     the numbers.
   * @param migrationListener The {@link BlockedNumbersMigrator.Listener} to call when the migration
   *     is complete.
   * @return The new MigrateBlockedNumbersDialogFragment.
   * @throws NullPointerException if blockedNumbersMigrator or migrationListener are {@code null}.
   */
  public static DialogFragment newInstance(
      BlockedNumbersMigrator blockedNumbersMigrator,
      BlockedNumbersMigrator.Listener migrationListener) {
    MigrateBlockedNumbersDialogFragment fragment = new MigrateBlockedNumbersDialogFragment();
    fragment.blockedNumbersMigrator = Objects.requireNonNull(blockedNumbersMigrator);
    fragment.migrationListener = Objects.requireNonNull(migrationListener);
    return fragment;
  }

  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
    super.onCreateDialog(savedInstanceState);
    AlertDialog dialog =
        new AlertDialog.Builder(getActivity())
            .setTitle(R.string.migrate_blocked_numbers_dialog_title)
            .setMessage(R.string.migrate_blocked_numbers_dialog_message)
            .setPositiveButton(R.string.migrate_blocked_numbers_dialog_allow_button, null)
            .setNegativeButton(R.string.migrate_blocked_numbers_dialog_cancel_button, null)
            .create();
    // The Dialog's buttons aren't available until show is called, so an OnShowListener
    // is used to set the positive button callback.
    dialog.setOnShowListener(
        new OnShowListener() {
          @Override
          public void onShow(DialogInterface dialog) {
            final AlertDialog alertDialog = (AlertDialog) dialog;
            alertDialog
                .getButton(AlertDialog.BUTTON_POSITIVE)
                .setOnClickListener(newPositiveButtonOnClickListener(alertDialog));
          }
        });
    return dialog;
  }

  /*
   * Creates a new View.OnClickListener to be used as the positive button in this dialog. The
   * OnClickListener will grey out the dialog's positive and negative buttons while the migration
   * is underway, and close the dialog once the migrate is complete.
   */
  private View.OnClickListener newPositiveButtonOnClickListener(final AlertDialog alertDialog) {
    return new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);
        alertDialog.getButton(AlertDialog.BUTTON_NEGATIVE).setEnabled(false);
        blockedNumbersMigrator.migrate(
            new Listener() {
              @Override
              public void onComplete() {
                alertDialog.dismiss();
                migrationListener.onComplete();
              }
            });
      }
    };
  }

  @Override
  public void onPause() {
    // The dialog is dismissed and state is cleaned up onPause, i.e. rotation.
    dismiss();
    blockedNumbersMigrator = null;
    migrationListener = null;
    super.onPause();
  }
}
